My theory is that until the water level drops to the next sensor the reading doesn't change.
The other problem is that the position of the sensors may be incorrect.
If the MH is not level this will affect reading.
Water level indicators are renouned for being inaccurate.
Chris

Average Salary of an Astronaut: £40,000 to £86,000 a year
Career Advancement: Excellent for science, research and engineering
Job Requirements: Incredible fitness and academic credentials
Danger Factor: Surprisingly not too bad – only 22 have died in the history of spaceflight
Pros: You get to fly a space shuttle
Cons: Famously hard to catch a career break and the work is mentally and physically grueling.

I thought I was daft ................. then I read most of your answers and realised it was you lot.... Thanks all for your responses... Yep. think it cos my van not quite level, or that my sticker up is stuck up.. or the panel not accurate, which I can cope with.

Don't think my van is upside down but one never knows these days... could be the clever manufacturers put the wheels on top of the van instead of the bottom ....

When the last tree is cut,
the last river is poisoned,
the last fish is caught,
then only, will man discover,
that he cannot eat money.

What we want is SOLUTIONS! It's no good all of us saying they're unreliable.

The one on my previous old van was spot-on. So I spend zillions on a new 'van and as soon as you put a cupfull of water in it, the needle goes past the full to end-stop! It's not something you can check at the dealership and I can't 'dip' the tank because it's under-floor.

I'm cheesed off with it. It's not just a question of having to leave the dishes till the morning. For me, a lack of water means no toilet flush either!

On my last sortie a few days ago, I had to fill up until it overflowed, then open the drain cock and drain off bucket loads of water until I thought I had the right level for the journey. I rarely travel with a full tank, coz for me (with a 70 litre tank) it's over 150 pounds in weight!

But there are usually sensors only at 25%, 50% and 75% as well as allegedly full and allegedly empty. The manufacturers have to strike a balance between what most people will be happy with and the costs associated with an accurate system, which most people don't think you need anyway........... Most of us don't need a solution, really.

To be honest, I did check out the system readouts on the Pilote and it is surprisingly close. Works for us!

Dux Deluxe

Half baked Duck Tactics, as the Germans sayI don't have an Oyster Internet system
But I do have an Oyster card

there is a difference between ideal technology that works correctly and a simple system that+ is cheap and easy to fit. most vans have the cheap version...... a set of brass pins stuck through the side of the tank. as the water level goes up, it covers the pins in sequence making an electrical circuit. simple and effective till the pins corrode

if the gauge constantly says full, its likely a short circuit on the wires on a basic system and a stuck float in a more expensive one

life is not a race to the end, but a leisurely journey enjoying the scenery